- Women of child-bearing potential must have a negative serum pregnancy test within 7 days of the first DCE-MRI and must have agreed to use an effective contraceptive method; the effects of iRGD on the developing fetus are unknown; for this reason, women of child-bearing potential and men must agree to use adequate contraception (hormonal or barrier method of birth control or abstinence) prior to study entry and for six months following duration of study participation; should a woman become pregnant or suspect that she is pregnant while participating on the trial, she should inform her treating physician immediately